The effects of methanol cofeeding on reaction performances and reaction pathways for light olefin production from butene were investigated. Reactions under different conditions were carried out, and the kinetics of butene consumption was established using the integration method. On the basis of the kinetic study, the reaction pathways for butene conversion changed due to the cofeeding and much higher conversion of butene was found in the cofeeding reaction than that of the butene cracking when extrapolation to space time was 0, indicating that conversion of butene was promoted when methanol joined the reaction due to the coreaction of butene and methanol. The reaction activity was improved due the cofeeding, leading to significant improvements in reaction performances for light olefin production from butene, especially under conditions of high WHSV and low concentration of butene or on stream treated catalysts. The results indicated that the cofeeding reaction was a feasible way to raise throughput and cope with hydrothermal deactivation for feeds with low butene concentrations.